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Section 10
Testing functionality by secondary injection
10.4.11.1
122
Verifying the settings
It is assumed that setting of the pole slip protection function PSPPPAM is done
according to impedances as seen in figure
The test is done by means of injection of three-phase current and three-phase voltage
from a modern test device. This test device shall be able to give voltage and current
with the possibility to change voltage and current amplitude and the angle between the
injected voltage and current. The parameter setting shall be according to the real
application chosen values.
Procedure
1.
Feed the IED with current and voltage corresponding to a normal operation point
Injected voltage U equal to base voltage (UBase) and the injected current I equal
to half the base current (IBase). The angle between the voltage and current shall
be 0°.
2.
With maintained amplitude of the injected voltage the current amplitude and
angle is changed to a value ZC/2.
This is done with a speed so that the final impedance is reached after 1 second.
As the injected voltage is higher than 0.92 UBase no START signal should be
activated.
3.
With reduced amplitude of the injected voltage to 0.8 UBase the current
amplitude and angle is changed to a value ZC/2.
This is done with a speed so that the final impedance is reached after 1 second.
As the injected voltage is lower than 0.92 UBase the START signal should be
activated.
4.
With reduced amplitude of the injected voltage to 0.8 UBase the current
amplitude and angle is changed via ZC/2 to a value corresponding to half IBase
and 180° between the injected current and voltage.
This is done with a speed so that the final impedance is reached after 1 second.
As the injected voltage is lower than 0.92 UBase the START signal should be
activated. In addition to this the signal ZONE1 should be activated.
5.
Set N1Limit to 1 and repeat step 4.
Now the signals TRIP1 and TRIP should be activated.
6.
With reduced amplitude of the injected voltage to 0.8 UBase the current
amplitude and angle is changed via ZC + (ZA – ZC)/2 to a value corresponding
to half IBase and 180° between the injected current and voltage.
This is done with a speed so that the final impedance is reached after 1s. As the
injected voltage is lower than 0.92 UBase the START signal should be activated.
In addition to this the signal ZONE2 should be activated.
7.
Set N2Limit to 1 and repeat step 6.
Now the signals TRIP2 and TRIP should be activated.
1MRK 506 355-UEN A
29
and figure 30.
Line distance protection REL670 2.1 IEC
Commissioning manual
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